package model;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * model.User: lucky
 * Date: 2022-10-24
 * Time: 0:24
 */
public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/blog?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "4444";

    private static volatile DataSource dataSource = null;

    private static DataSource getDataSource(){
        if(dataSource == null){
            synchronized (DBUtil.class){
                if(dataSource == null){
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }

        return dataSource;
    }
    public static Connection getConnection() throws SQLException {
        return getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet) {
        if(connection != null){
            try{
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement != null){
            try{
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(resultSet != null){
           try{
               resultSet.close();
           } catch (SQLException e) {
               e.printStackTrace();
           }
        }
    }
}
